The present invention relates to a cable jacket composition comprising a multimodal olefin copolymer, wherein said olefin copolymer has a density of 0.935-0.960 g/cm3 and MFR2 of 1.5-10.0 g/10 min and comprises a bimodal polymer mixture of a low molecular weight homo- or copolymer and a high molecular weight copolymer wherein the composition has ESCR of at least 2000 hours and wherein the numerical values of cable wear index and composition MFR2 (g/10 min) follow the correlation: Wear index<15.500+0.900*composition MFR2. The invention further relates to the process for preparing said composition and its use as outer jacket layer for a cable, preferably a communication cable, most preferably a fiber optic cable.

A catalyst for the polymerization of olefins made from or containing (a) a solid catalyst component containing Mg, Ti and optionally an internal electron donor compound (ID), (b) an aluminum alky compound, and (c) an external electron donor (ED) selected from non-aromatic diazo compounds.

The present disclosure relates to a method for preparing a polyolefin using a supported hybrid metallocene catalyst. According to the present disclosure, a polyolefin having a narrow molecular weight distribution can be prepared very effectively by introducing a cocatalyst in an optimum content in the presence of a supported hybrid metallocene catalyst containing two or more metallocene compounds having a specific chemical structure. The polyolefin prepared according to the present disclosure exhibits excellent uniformity in chlorine distribution in polyolefin during chlorination, thereby significantly improving elongation of the chlorinated polyolefin, compatibility with PVC and impact reinforcing performance. Thus, it exhibits excellent chemical resistance, weather resistance, flame retardancy, processability and impact strength reinforcing effect, and can be suitably applied as an impact reinforcing agent for PVC pipes and window profiles.

The present disclosure relates to a method for preparing a polyolefin using a supported hybrid metallocene catalyst. According to the present disclosure, a polyolefin having a narrow molecular weight distribution can be prepared very effectively by introducing a cocatalyst in an optimum content in the presence of a supported hybrid metallocene catalyst containing two or more metallocene compounds having a specific chemical structure. The polyolefin prepared according to the present disclosure exhibits excellent uniformity in chlorine distribution in polyolefin during chlorination, thereby significantly improving elongation of the chlorinated polyolefin, compatibility with PVC and impact reinforcing performance. Thus, it exhibits excellent chemical resistance, weather resistance, flame retardancy, processability and impact strength reinforcing effect, and can be suitably applied as an impact reinforcing agent for PVC pipes and window profiles.

The present invention relates to use of optionally monosubstituted 2,2-di(tetrahydrofuryl)methanes, as internal donors in Ziegler-Natta catalysts to obtain polymers with desirable properties. The present disclosure further concerns Ziegler-Natta catalyst components comprising said optionally monosubstituted 2,2-di(tetrahydrofuryl)methanes and Ziegler-Natta catalysts for olefin polymerization comprising said Ziegler-Natta catalyst components as well as a method for preparing the same and their use in providing polyolefins.

Processes of polymerizing olefins include contacting ethylene, a (C.sub.3-C.sub.40)alpha-olefin comonomer, and a solvent in the presence of a chain transfer agent and a catalyst system, the catalyst system comprising a metal-ligand complex according to formula (I).

##STR00001##

The present invention provides an adhesive composition including an ethylene/alpha-olefin copolymer; and a tackifier, wherein the ethylene/alpha-olefin copolymer has narrow molecular weight distribution together with a low density and an ultra low molecular weight, minimized number of unsaturated functional groups, uniform crystallinity, thereby showing excellent physical properties.

A metallocene complex of formula (I): each X is a sigma-ligand; in the group R.sub.2Si— at least one R is methyl or ethyl, and the other R is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl or isobutyl, pentyl, hexyl, cyclohexyl and phenyl; each R.sup.1 independently is the same or can be different and are a CH.sub.2—R.sup.7 group, with R.sup.7 being H or linear or branched C.sub.1-6-alkyl group, C.sub.3-8 cycloalkyl group, or C.sub.6-10 aryl group; each R.sup.2 is independently a —CH═, —CY═, —CH.sub.2—, —CHY— or —CY.sub.2— group, wherein Y is a C.sub.1-6 hydrocarbyl group and where n is 2-6; each R.sup.3 and R.sup.4 are independently the same or can be different and are hydrogen, a linear or branched C.sub.1-6-alkyl group, a C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group, C.sub.6-20 aryl group, or an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group; R.sup.5 is a linear or branched C.sub.1-6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-20-aryl group; and R.sup.6 is a C(R.sup.8).sub.3 group, with R.sup.8 being a linear or branched C.sub.1-6 alkyl group; (A) wherein at least one R.sup.3 per phenyl group and at least one R.sup.4 is not hydrogen, and wherein at least one R.sup.3 per phenyl group and at least one R.sup.4 is hydrogen; or (B) wherein one R.sup.3 is an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group, in 4 position of each phenyl group and the two other R.sup.3 groups are tert-butyl groups; and/or (C) wherein one R.sup.4 is an —OY group, wherein Y is a is a C.sub.1-6 hydrocarbyl group, in 4-position of the phenyl ring and the two other R.sup.4 groups are tert-butyl groups.

##STR00001##

The present disclosure relates to a Ziegler-Natta catalyst system with self-extinguishing properties suitable for olefin polymerization. The catalyst system of the present disclosure comprises a pro-catalyst, a co-catalyst, and an external donor having a mixture of a selectivity control agent and an activity control agent. The catalyst system of the present disclosure is adapted to prevent the temperature of the polymerization reaction to go beyond the softening temperature of the polymer, thereby exhibiting the self-extinguishing properties.

The present invention relates to Ziegler-Natta catalyst components for olefin polymerization employing specific carbonate compounds as an element of solid catalyst composition in conjunction with at least one or more internal donor compounds, for producing polyolefins, particularly polypropylene and ethylene-propylene block co-polymer, which exhibits substantially high rubber content with higher stereo-regularity and hydrogen response.